Characterization of damage processes in Montney siltstone under triaxial compression using acoustic emission and diagnostic imaging

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dc.contributor.authorJia, Suzie
dc.contributor.authorWong, Ron
dc.contributor.authorEaton, David
dc.date.accessioned2021-11-11T01:57:29Z
dc.date.available2021-11-11T01:57:29Z
dc.date.issued2021-11-04
dc.descriptionArticle accepted for publication by Geophysical Journal Internationalen_US
dc.description.abstractCrack nucleation and rock failure processes in a fine-grained siltstone (Montney Formation) under triaxial compression are investigated using combined diagnostic techniques, including ultrasonic-wave measurement, acoustic-emission (AE) monitoring, computed tomography (CT) scanning, and thin-section imaging. The sample displays a weak-to-moderate inherent seismic anisotropy and noticeable stress-induced anisotropy prior to failure. No AE event was detected until the applied axial stress reached 95% of the peak value. The signal-to-noise ratio is relatively low, however, and detectable AE events are more diffuse than those observed in highly brittle rocks. The AE locations correlate with a shear fracture zone imaged by CT scanning. AE moment-tensor analysis reveals that events with larger relative magnitudes are characterized by high volumetric (tensile or compressive) components, and the initiation of the failure zone is dominated by combined shear-tensile failure. Stress inversion of the AE events with high tensile components is in good agreement with the known applied stress. Microscopic imaging of thin sections from the failed sample shows that the failure zone is an en echelon structure consisting of a major fracture with branching micro and minor cracks. This failure mechanism is consistent with a shear-tensile source mechanism and is interpreted to be associated with the fine granular structure and mineral composition of Montney siltstone.en_US
dc.description.grantingagencyNatural Sciences and Engineering Research Council (NSERC)en_US
dc.identifier.citationJia, S. Q., Wong, R. C. K., and Eaton, D. W. (2021). Characterization of damage processes in Montney siltstone under triaxial compression using acoustic emission and diagnostic imaging. Geophysical Journal International, ggab455. https://doi.org/10.1093/gji/ggab455en_US
dc.identifier.doihttps://academic.oup.com/journals/pages/access_purchase/rights_and_permissions/author_self_archiving_policyen_US
dc.identifier.grantnumberCRDPJ/474748-2014en_US
dc.identifier.issn0956-540X
dc.identifier.issn1365-246X
dc.identifier.urihttp://hdl.handle.net/1880/114109
dc.identifier.urihttps://dx.doi.org/10.11575/PRISM/39380
dc.language.isoengen_US
dc.publisherOxford University Pressen_US
dc.publisher.departmentGeoscienceen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionsubmittedVersionen_US
dc.publisher.policyhttps://academic.oup.com/journals/pages/access_purchase/rights_and_permissions/author_self_archiving_policyen_US
dc.rightsThis article has been accepted for publication in Geophysical Journal International Published by Oxford University Press on behalf of the Royal Astronomical Society.en_US
dc.subjectacoustic emissionsen_US
dc.subjectgeomechanicsen_US
dc.subjectgeophysicsen_US
dc.subjectMontney Formationen_US
dc.titleCharacterization of damage processes in Montney siltstone under triaxial compression using acoustic emission and diagnostic imagingen_US
dc.typejournal articleen_US
ucalgary.item.requestcopytrueen_US
ucalgary.scholar.levelGraduateen_US
ucalgary.scholar.levelFacultyen_US
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